【摘要】 基于实测的军事地形图和Landsat遥感影像,重建了20世纪30年代至2015年的近百年长江荆江段河道演变空间数据集,并以此为基础使用计盒维数法在ArcGIS 10.2平台上测算得出河道分形维数近百年来的变化过程。研究表明:荆江河道具有明显的分形特征,河道分维数值在1.074 7～1.049 1之间变动,平均值为1.061 3。近百年来荆江河道演变可以划分为2个阶段:20世纪30～50年代和1976～2015年,其分维均值分别为1.074 3和1.052 6。近百年来荆江河道处于逐渐趋于稳定的过程中。各时间断面下荆江的分维值都高于上荆江,下荆江的河流复杂程度大于上荆江,且荆江河道分维的变化主要取决于下荆江。近百年来荆江河道分维下降的原因主要是1949年后荆江河道大规模治理和人工截弯取直。更多还原

【Abstract】 Based on the historical military topographic maps and Landsat TM/ETM + remote sensing images,the spatial data set of river course evolution in Jingjiang River section of the Yangtze River from 1930 s to 2015 reconstructed in this study. On this basis, the evolutionary process of river fractal dimension over the last 100 years calculated on ArcGIS 10.2 platform by using box counting dimension method. The results show that the Jingjiang River section of the Yangtze River has obvious fractal characteristics, and the river fractal dimension varies from 1.074 7 to 1.049 1 with an average of 1.061 3. The evolution of Jingjiang River section of the Yangtze River in the past 100 years can be divided into two stages: 1930 s-1950 s and 1976-2015, with the average fractal dimension of 1.074 3 and 1.052 6 respectively. In the past 100 years, Jingjiang River section of the Yangtze River has been in the process of gradually stabilizing. The fractal dimension and complexity of down Jingjiang River section over the past 100 years is higher than that of up Jingjiang River section in each time,and the change of fractal dimension of whole Jingjiang River section mainly depends on that of down Jingjiang River section. The main reasons for the decline of river fractal dimension in the past 100 years are the largescale governance of Jingjiang River section and river cut off projects after 1949.更多还原